Where is a common place for corrosion to occur when using a reboiler with a fractionation column?

Corrosion is a significant concern in any process involving a reboiler and fractionation column, and the area where the hot process returns is particularly susceptible. This susceptibility is often due to the combination of high temperatures and the presence of heavy hydrocarbons and/or water, which can lead to a corrosive environment.

In this specific case, the area where the hot process returns is typically a region of high turbulence and temperature fluctuations. These conditions can promote localized corrosion mechanisms such as pitting or erosion-corrosion. This practical understanding aligns well with the types of materials used in these areas and the nature of the fluids being processed.

Additionally, the transition between phases—particularly when vapor re-entrains liquid—can contribute to conditions that exacerbate corrosion. Identifying areas with high risk, like the return points of hot process streams, allows for targeted inspection and preventive measures to mitigate corrosion-related challenges effectively.